There's a lot of reasons to be skeptical about it happening. For one, it would be another layer of fragmentation for iOS, something Apple has tried its best to avoid. For another, it's coming for unknown supply chain sources. Apple could be testing a big phone, but that doesn't mean it will make one.

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Having access to various smartphones, I find once you get beyond 4.5" the usability takes a hit. It's ackward to hold and is more tablet then smartphone. I guess if your goal is one device but I'd rather have a solid 3-4" screen and pair with a tablet / ultrabook.

That said iPhone issue isn't hardware, iOS is stale and used as a glorified App launcher. There has not been a significant update to improve iOS since 4.0.